linux-kernel - [PATCH v2 6/6] iommu/vt-d: Make DMAR_UNITS

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Message-Id: <20220702015610.2849494-7-baolu.lu@linux.intel.com>
Date:   Sat,  2 Jul 2022 09:56:10 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>, Steve Wahl <steve.wahl@....com>,
        Kevin Tian <kevin.tian@...el.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Jerry Snitselaar <jsnitsel@...hat.com>,
        Mike Travis <mike.travis@....com>,
        Dimitri Sivanich <sivanich@....com>,
        Russ Anderson <russ.anderson@....com>, iommu@...ts.linux.dev,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH v2 6/6] iommu/vt-d: Make DMAR_UNITS_SUPPORTED default 1024

If the available hardware exceeds DMAR_UNITS_SUPPORTED (previously set
to MAX_IO_APICS, or 128), it causes these messages: "DMAR: Failed to
allocate seq_id", "DMAR: Parse DMAR table failure.", and "x2apic: IRQ
remapping doesn't support X2APIC mode x2apic disabled"; and the system
fails to boot properly.

To support up to 64 sockets with 10 DMAR units each (640), make the
value of DMAR_UNITS_SUPPORTED default 1024.

Signed-off-by: Steve Wahl<steve.wahl@....com>
Link: https://lore.kernel.org/linux-iommu/20220615183650.32075-1-steve.wahl@hpe.com/
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@...el.com>
---
 include/linux/dmar.h | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index cbd714a198a0..d81a51978d01 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -18,11 +18,7 @@
 
 struct acpi_dmar_header;
 
-#ifdef	CONFIG_X86
-# define	DMAR_UNITS_SUPPORTED	MAX_IO_APICS
-#else
-# define	DMAR_UNITS_SUPPORTED	64
-#endif
+#define DMAR_UNITS_SUPPORTED	1024
 
 /* DMAR Flags */
 #define DMAR_INTR_REMAP		0x1
-- 
2.25.1